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v3.23.1

Significant Accounting Policies - Product Sales Discounts and Allowances Continued (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($)
Current period | $ 235
Payments and customer credits issued | (1)
Provision for discounts and allowances, ending balance | 234
Chargebacks, Discounts for Prompt pay and Other allowances |
Current period | 72
Payments and customer credits issued | (1)
Provision for discounts and allowances, ending balance | 71
Rebates, Customer Fees/Credits and Co-pay Assistance |
Current period | 163
Provision for discounts and allowances, ending balance | $ 163

X
- Definition Payments made against the Company's provision for product sales discounts and allowances. + References No definition available. + Details
Name: | fenc_DiscountsAndAllowancesPaymentsAndCustomerCreditsIssued
Namespace Prefix: | fenc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) for expected discounts and allowances on gross sales. + References No definition available. + Details
Name: | fenc_DiscountsAndAllowancesProvisionForCurrentPeriodSales
Namespace Prefix: | fenc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Provision for aggregate discounts and allowances provided to customers and offset to gross revenues earned. + References No definition available. + Details
Name: | fenc_ProvisionForDiscountsAndAllowances
Namespace Prefix: | fenc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_StatementScenarioAxis=fenc_ChargebacksDiscountsForPromptPayAndOtherAllowancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=fenc_RebatesCustomerFeesCreditsAndCoPayAssistanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |